231019 has 2 divisors, whose sum is σ = 231020. Its totient is φ = 231018.

The previous prime is 231017. The next prime is 231031. The reversal of 231019 is 910132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231019 - 2¹ = 231017 is a prime.

It is a super-2 number, since 2×231019² = 106739556722, which contains 22 as substring.

Together with 231017, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 230993 and 231011.

It is not a weakly prime, because it can be changed into another prime (231017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115509 + 115510.

It is an arithmetic number, because the mean of its divisors is an integer number (115510).

2²³¹⁰¹⁹ is an apocalyptic number.

231019 is the 278-th hex number.

231019 is a deficient number, since it is larger than the sum of its proper divisors (1).

231019 is an equidigital number, since it uses as much as digits as its factorization.

231019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 231019 is about 480.6443591680. The cubic root of 231019 is about 61.3596066024.

The spelling of 231019 in words is "two hundred thirty-one thousand, nineteen".